Closure alarm



Nov. 9, 1937.

F. MQ scHULTz CLOSURE ALARM Filed April 27, 1936 INVENTOR. FEED /2 6cm/r2 ATTORNEY.

Patented Nov. 9,V 1937 UNITED #STATES PATENT` O'FFECE oLo SURE ALARM Fred M. schuuapetrtit, Mich. Application April 27. 1936. serial No. 76,616

2 Claims.

vide a device of this class which will be simple in structure, economical vof manufacture and highly eiicient in use.

Another object of theinvention is the provision of a closure alarm of this class in which a releasable member will be released upon the opening of the closure and moved to position to explode an explosive cap. Y

Another object of the invention is the provision of a closure alarm of this class so constructed and arranged that the explosive cap will normally be enclosed in a housing and so constructed and arranged that when the housing is moved to position to expose the cap anvil the device will be inoperative to explode the cap.

Another object of the invention is the provision in a device of this class of a novel construction of washer for engaging a spring which serves to actuate the exploding plunger.

Another object of the invention is the provision of a device of this class which will be light, durable and easily and quickly installed in position.

Other objects will appear hereinafter.

The invention consists in the combination and arrangement of parts hereinafter described and claimed.

The invention will be best understood by a reference to the accompanying drawing which forms a part of this specification, and in which,

Fig. l is a front elevational view of the invention.

Fig. 2 is a top plan View of the invention.

Fig. 3 is a front elevational view of the invention with a part broken away and shown in section.

Fig. 4 is a sectional view taken on line 4-4 of Fig. 3.

Fig. 5 is a sectional view taken on line 5-5 of Fig. 4.

Fig. 6 is a side elevational View of the invention showing the housing moved to exposing position.

Fig. 7 is a perspective view of the plunger and the washer disassembled.

Fig. 8 is an enlarged fragmentary perspective view showing a locking device in position.

The invention comprises a back plate I2 which may be secured by screws I3 or the like to a' suit- Y able supporting body I4. Adjacent the supporting body is located the closure` I5. Projecting outwardly from the back plate is a boss I5 through which is formed the passage I1. Slidably projected through this passage I1 is the plunger or rod I8 having its upper end ,angularly turned to provide the abutment arm I9, this arm normally resting above a pair of yoke arms 20 and 2I between which the rod I8 is adapted to slide. The lower end of the rod I8 is tapered as at 22 to'provide a head. 'Ihis head is out away .as at' 23 to provide- -a neck 24 which communicates with a reduced portion 25,k An abutment washer 2B having a central opening 21 formed therein is cut away as at 28,. this cut away' portion 28 being adapted to pass overv the reduced portion 25 so that the opening 21 may slide over the neckV 24. When the washer is in this lposition it is locked until it is raised into registration with the reduced portion 25. Embracing the rod I8 and engaging at one end the boss I6 and at the opposite end the washer 26 is a spring 29 so arranged and constructed that when the arm I9 is moved to register with the space between the yoke arms 20 and 2|, the spring 29 will force the head or tapered portion 22 downwardly so ,as to strike the anvil 3| which is carried by the stem 32 pressed into the socket 34 formed on the boss 35 which projects outwardly from the back plate I2, A cup-shaped explosive cap is used which is placed in inverted position over the anvil 3| so that when the device is operated and the plunger or rod I8 is forced downwardly to bring the head or tapered portion 22 into engagement with the cap, the cap will be exploded. When it is desired to lock the device in inoperative position a pin 36 may be projected through openings formed in the yoke arms 20 and 2|. These yoke arms are beveled as at 31 so Vthat the arm I9 may be thrown to either` side from its position of engagement with the pin 36.

Formed in opposite sides of the back plate I2, adjacent the rear end thereof, are the grooves 38 and 39 in which engage the inturned flanges 40 and 4I of the U-shaped housing 42. This housing is provided on its upper end with the inturned tongue 43 which will engage the upper face of the boss I6 when moved downwardly to its lowermost position. When moved downwardly to its lowermost position this housing will enclose the anvil and explosive cap so that when the explosion takes place no re will be permitted to pass from the housing. When it is desired to place a new cap upon the anvil 3I, the rod I8 is raised upwardly against the compression of the spring and the arm I9 pressed upwardly, as shown in Fig. 1 or Fig. 8, s'o as to overlie one' of the yoke arms 20 or 2|. The tongue 43 will then be in position to prevent a return of the arm |9 into registration with the space between the yoke arm so that when in this position, the housing 42 will serve as a protective guard against undue operation of the device. Should the arm I9 be turned into position for registering between the members 2D and 2| while the housing 42 is raised to its elevated position, the plunger I8 would still not be permitted to slide downwardly with sufficient forcepto cause an explosion because the housing 42 so snugly engages the plate on which it is slidably mounted as to resist the pressure of the spring 29. It will be noted that the housing projects outwardly beyond the boss 35, thus leaving an opening between these parts. The housing, thus, provides an exploding chamber and the passage or opening referred to provides a sound outlet so that when the explosive cap is exploded,

the sound is permitted to escape while the housing forms a shield against flash, iiame or Yparticles of the explodedV cap.

In use the device is mounted on a'suitable support and the arm I9 is swung into position in front of the enclosure, so that when the closure is opened the arm |9 will be swung to register with the space between the yoke arms. As soon as this position is reached, the springv will force the plunger downwardly to'explode the cap which is positioned on the anvil 3| and this vanvil may be considered an engagementfmember for engaging the plunger. The plunger may be termed an exploding plunger becausetit eiects an explosion of the cap and when moved to the dotted lineposition shown in Fig. 4 the plunger may be saidrto bein operative position, while it ,may be termed, when' moved tothe position shown in Fig. l or Fig. 3, `to bein the cocked position.

While I have illustrated and described the preferred form of construction, I do not wish to limit myself to the precise details of structure shown, but desire to avail myself of such variations and modifications as may appear within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A device of the class described, comprising: a supporting member; an engagement member carried by said member adapted for the reception of an exploding cap; an explosive plunger adapted for movement into engagement with said cap for exploding the same; a spring for moving said plunger into exploding position; a laterally turned portion on said plunger; means for en gaging' said laterally turned portion upon movement of said plunger into cocked position for retaining the same in said position; a housing for enclosingsaid engagement member, said housing being slidable on said supporting member to position for uncovering said engagement member; and means on said housing upon movement of the same to uncovering position for preventing the disengagement Vof said laterally turned portion from said means.

2, A device of the class described, comprising:

a supporting member; an engagement member .carried by vsaid supporting member, adapted for 

